Cycling

Cyclists Who Train at the Wrong Intensity Are Burning the Wrong Fuel. The Number That Exposes the Problem Is a Simple Ratio Between the CO₂ You Exhale and the O₂ You Inhale — and Most Athletes Have Never Measured It.

The respiratory exchange ratio (RER) reveals what fuel your body is burning at any exercise intensity. Learn how RQ and fat max testing work, what RER 0.70–1.00 means for training zones, and how to estimate your crossover point in the field.

5 分鐘閱讀 · 2026-10-27

Power-to-Weight Ratio (W/kg): Why It Beats Raw Watts on Climbs

On gradients above 4%, power-to-weight ratio (W/kg) determines climbing performance — not absolute wattage. Optimising W/kg requires body composition changes that preserve power while reducing fat mass. Aggressive weight loss below a critical threshold risks power loss, RED-S, and performance decline.

5 分鐘閱讀 · 2026-10-13

Negative Split Pacing: The Physics of Time Trial Strategy

Even split vs negative split pacing for cycling time trials: the physics, the critical power model, and why going out hard almost always costs you time in the end.

5 分鐘閱讀 · 2026-10-06

L-Citrulline Malate for Cycling: The Nitric Oxide Evidence

Why L-citrulline outperforms L-arginine for nitric oxide production in cyclists — the eNOS pathway, urea cycle bypass, and 8g dosing protocol backed by Pérez-Guisado 2010.

5 分鐘閱讀 · 2026-09-15

Inspiratory Muscle Training: The Respiratory Limiter Intervals Miss

Dempsey 2006 identified the metaboreflex: inspiratory muscle fatigue diverts blood from working legs. McConnell Romer 2004 shows IMT gives 15% performance gain. Here's the protocol.

5 分鐘閱讀 · 2026-09-08

Fasted Cardio Burns More Fat During the Session. It Does Not Burn More Fat Overall.

Fasted cardio increases fat oxidation during the session but produces no additional fat loss over 24 hours. Here is what the evidence says about substrate use and body composition.

5 分鐘閱讀 · 2026-08-25

Cycling Gear Ratios: The Physics of Riding in the Right Gear

Gear selection is one of the most undercoached skills in cycling. Most amateurs spin too low or grind too high — and neither produces optimal power output.

4 分鐘閱讀 · 2026-08-25

Dark Chocolate Flavanols and Cycling Performance: The Evidence

Cocoa flavanols and (-)-epicatechin boost endothelial nitric oxide production, improving oxygen delivery during cycling. Here's what the research actually shows.

5 分鐘閱讀 · 2026-08-11

Cycling Aerodynamics: How CdA Converts Power Into Speed

Aerodynamic drag dominates cycling power demand above 25 km/h. Understanding CdA and the power-speed cube law shows where your watts are actually going — and where the biggest savings are.

5 分鐘閱讀 · 2026-08-04

Cycling Calories and Fuelling: The Calculation Most Riders Get Wrong

Generic cycling calorie calculators are wildly inaccurate. Power output, rider weight, gradient, and drafting all interact in ways that simple MET-based formulas completely ignore.

5 分鐘閱讀 · 2026-08-04

Long Ride Fuelling: The Gel Protocol That Prevents the Bonk

A 75kg cyclist burning 750 kcal/hr on a 4-hour ride needs 180g exogenous carbohydrate to avoid glycogen depletion — that is 7–8 gels at 25g each. Most cyclists carry two or three. The deficit produces the bonk.

5 分鐘閱讀 · 2026-08-04

Compact vs Standard Chainring: Which Gearing Suits Sportive Riders

Standard 53/39 gearing is designed for racing professionals. Most sportive and gran fondo riders should ride compact 50/34 or sub-compact 48/32 — here is the gear ratio mathematics.

5 分鐘閱讀 · 2026-07-28

Every Road Bike Ships With the Wrong Crank Length for Most Riders

170–175mm cranks are industry default, but femur length determines optimal crank arm length. Here's the biomechanics evidence for personalised cycling fit.

5 分鐘閱讀 · 2026-07-28

Coggan Power Profiling: What Your Power Curve Says About Your Phenotype

Coggan power profiling maps neuromuscular, anaerobic, aerobic and threshold power to identify your cycling phenotype — sprinter, TT specialist, climber or pursuiter — and direct training priorities.

5 分鐘閱讀 · 2026-07-21

Carb Cycling: Training-Day vs Rest-Day Nutrition for Athletes

Carbohydrate cycling — varying carbohydrate intake based on daily training demand — optimises muscle glycogen on high-output days while improving fat oxidation on low-output days. The mechanism is GLUT4 translocation and post-exercise insulin sensitivity.

5 分鐘閱讀 · 2026-07-14

Why Your Cycling Calorie Calculator Lies at Altitude — And What to Do About It

At 2,000+ metres, standard cycling calorie formulas underestimate your energy burn by 6–12%. Here's the hypoxic physiology behind the gap.

5 分鐘閱讀 · 2026-06-23

1x vs 2x Drivetrain: Gear Range, Cross-Chaining and Efficiency

The switch from 2x to 1x drivetrains has swept gravel and MTB. But does a 1x system deliver equivalent gear range, and what does cross-chaining actually cost in efficiency? Here's the maths.

5 分鐘閱讀 · 2026-06-16

單車 FTP：什麼是好成績？（按能力等級的瓦特/公斤對照表）

9 分鐘閱讀 · 2026-04-07